ColorGenerator.java

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package jarmos.visual;

public class ColorGenerator {

    public ColorMap ColorMap;

    public float alphaValue = 0.8f;

    public float[] getDefaultColor(int size) {
        float[] colors = new float[size * 4];
        for (int i = 0; i < colors.length; i += 4) {
            colors[i] = 0.0f;
            colors[i + 1] = 0.0f;
            colors[i + 2] = 1.0f;
            colors[i + 3] = alphaValue;
        }
        return colors;
    }

    public float[] computeColors(float[] fieldValues) {

        float[] colors = new float[fieldValues.length * 4];
        float min = getMin(fieldValues);
        float max = getMax(fieldValues);

        // calculate color data
        for (int i = 0; i < fieldValues.length; i++) {
            float tmpvar = (fieldValues[i] - min) / (max - min);
            if (tmpvar <= 0.125f) {
                colors[i * 4 + 0] = 0.0f;
                colors[i * 4 + 1] = 0.0f;
                colors[i * 4 + 2] = 0.5f + tmpvar / 0.25f;
                colors[i * 4 + 3] = alphaValue;
            }
            if ((tmpvar > 0.125f) && (tmpvar <= 0.375f)) {
                colors[i * 4 + 0] = 0.0f;
                colors[i * 4 + 1] = 0.0f + (tmpvar - 0.125f) / 0.25f;
                colors[i * 4 + 2] = 1.0f;
                colors[i * 4 + 3] = alphaValue;
            }
            if ((tmpvar > 0.375f) && (tmpvar <= 0.625f)) {
                colors[i * 4 + 0] = 0.0f + (tmpvar - 0.375f) / 0.25f;
                colors[i * 4 + 1] = 1.0f;
                colors[i * 4 + 2] = 1.0f - (tmpvar - 0.375f) / 0.25f;
                colors[i * 4 + 3] = alphaValue;
            }
            if ((tmpvar > 0.625f) && (tmpvar <= 0.875f)) {
                colors[i * 4 + 0] = 1.0f;
                colors[i * 4 + 1] = 1.0f - (tmpvar - 0.625f) / 0.25f;
                colors[i * 4 + 2] = 0.0f;
                colors[i * 4 + 3] = alphaValue;
            }
            if (tmpvar > 0.875f) {
                colors[i * 4 + 0] = 1.0f - (tmpvar - 0.875f) / 0.25f;
                colors[i * 4 + 1] = 0.0f;
                colors[i * 4 + 2] = 0.0f;
                colors[i * 4 + 3] = alphaValue;
            }
        }
        return colors;
    }

    private float getMin(float[] values) {
        float min = values[0];
        for (int j = 0; j < values.length; j++) {
            min = (min > values[j]) ? values[j] : min;
        }
        return min;
    }

    private float getMax(float[] values) {
        float min = values[0];
        for (int j = 0; j < values.length; j++) {
            min = (min < values[j]) ? values[j] : min;
        }
        return min;
    }

}